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That is a very open ended question that will be hard to respond to without more information/constraints.
Are you talking Normaly Aspirated pump gas with no power adders, or race gas or other fuel, and are you using some sort of power adder?
You sat this is for a '70 GTX, but is it a street car or race car? How much does it weigh? what suspension, tires, gears, transmission, converter, etc are you using?

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First off let me state this for those who are not clear on this point a 5.99 in the 1/8th will be low 9.40's in the 1/4.

While I am quite sure it can be done my first question would be WHY? You are gonna need something north of 700hp and getting that from a set of factory iron heads will require a lot of money being thrown at them. The amount of money you will have to spend to achieve this woudl be better spent on better parts. I have gone 9.60's at 3050 with a set of iron heads, but I had enough can in it to go Comp racing Only so much you can get from a factory type head, so you are gonna have to make the motor think you got more by using a TON of cam. Now throw in a power adder and at least you can keep the dollar amount spent at a sane level for the return.

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most of my friends all run either ford or chevy and they have always laughed and said mopar has the ugliest and slowest cars. i guess its crazy to try and max out a factory combo but its just a personal thing now.

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Sounds to me like you are just trying to upset your buddies.
They wouldn't know what your combo is. Save yourself alot of money and put a set of aluminum heads on it and paint them. They won't have a clue.
From all the chevy guys running around here, it wouldn't take a 5.99 to beat any of them if they are NA. My opinion is that the bb chevys don't run without a power adder.
I have been 10.50's many moons ago with a 451", 906 headed, flat top pistons, small roller, on street tires, super stocks, at 3405 lbs.
And don't worry, you will always have them spending money to TRY and stay ahead.
That's what makes it fun.
And as far as the ugliest cars go. Ask them what their 1 of 3,658,548,461,257 camaros made is worth compared to your ugly old Mopar.

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Well feel free to throw your money away if you like. Just not a very easy pass no matter how many Benjamins you throw at it. Fully ported 906's are gonna need the kind of camshaft that kills springs in short order. 700hp with 906's is not territory many have ever entered.

Do you really have a glut of STOCK Headed non power adder chevies running those kind of numbers at that weight with stock suspensions?

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Well let me ask you this. If it was easy and inexpensive to make 700hp with ported factory iron heads why is it you dont see many doing it. Plenty of ported iron heads out there still, well maybe not a ton as they are very prone to cracking, but plenty of cores. Are the rest of us just foolish to spend our money of aftermarket heads if the cost is less building a set of iron heads to make 700hp?

As for swapping heads from iron ported pieces to OOTB -1's that woudl not be totally a surprise to me, especially if they were right from Indy. Their valve job leaves a lot to be desired. I would also ad that the combination of parts required to make a good working unported -1 head to a fully ported iron head would be a good deal different, at least in my book.

In the end it is your money. Obviously ported iron heads can make decent power without breaking the bank, but at the 700hp level is the cost worth it? I have been in the .60's at 3050 on ladder bars with iron heads with a basic combo. But that is a long way from .40's at 3200lbs on leafs. The head flow is just not there to support it IMO. You can "fool" the engine into thinking there is more there with a VERY aggressive cam choice but with that comes a price tag as well.

We were running 9.30's with OOTB -1's with a 511" wedge for the last two seasons. Very mild, very easy on parts combination with no fancy parts. Why put yourself through the pain of trying to do it with iron heads? Been my question from the beginning.

Obviously you believe different, that is the joy of this sport lots of ways to skin a cat. Different strokes for different folks, so go show me I am wrong, I will be the first to congratulate you on the accomplishment.

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