So...Pale_Roader ..What are you putting a DOHC into?
I had a girlfriend years ago that had a Shelby Daytona turbo II....That was impressive...

My challenger in my sig pic has a 440 with edelbrock rpm heads 9.8:1 compression edelbrock rpm cam,1.6 rockers,M1 intake 750 double pumper,headers,msd.Also has 3.55 gears with an 18 spline 4 speed.Just drove about 70 miles on wednesday and got 12 mpg.Never been able to get better than that,but I think I have way to much cam for highway cruising.But stand on it and its all smiles.

Thanks..killerbee69

Nice Challenger!.....We all understand... you just have to feel the power once in awhile... and you sacrfice economy ...but it sure is fun!...

Ever thought about a supercharger......like from the supercharger store?
Mopar Muscle did an article using a 318 and bolting on a super charger -it almost had 600 rear wheel hourse power! 11 second quarter mile times. They are now going to do a 273 and shooting for 500 hourse power and 25 miles to the gallon!

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No, thats about as far away from what i'm trying to do as you can get. 600rwhp and 11's...??? Mustangs can do that with 400 or less, some a decent amount less, and still not kill you at the pump. Besides, i've become a big fan ov naturally aspirated power. Anyone can go fast with boost...

Yes, that is what the article said in Mopar Muscle

It is expensive to supercharge your engine too, so I am going to put a tri-power on my 383 for my next build.

just finished it up about 3 weeks ago. 74 duster with reringed 400, pistons way down in the hole, small summit cam, its close in spec to a factory hp cam, performer intake 1 3/4" headers and a holley 750 vac secondary. i really wanted to run the thermoquad but it was giving me a hard time and i just wanted to be out driving it. t56 with 3.73s and 245 45 17s all around. i never wieghed it. i just took it on a 2900 mile round trip and got 19 mpg on the highway. my wheel alignment was really far out and it still needs some tuning. there has to be more left in it. i didnt want to do a full build on the 400 as i wanted to drive it first and see how it all worked together. im not going to be hitting the strip too often anymore so i built something that would just be fun. with gas prices what they are, i cant see how anyone could not factor them into a build. one thing i would like is to raise the compression when i do build it.then there ar eplenty of other options, i wonder how a long rod and short lighter piston would effect mileage, hp and torque. then of coarse there is the 451 or 496-500. i dont want a big choppy cam i want to keep a lot of torque down low in my cruise rpm with good throttle response. im not really looking to run 11s, more interested in driveabliity and an overall efficient combo with some good mpg, now if i could get all that and go 11.50 on a good day, that would be cool.

Well James,
19 MPG is pretty good for a Big block, I think I would build a mild 451, it will give you lots of torq and won't brake the bank building it.

i like the 451 idea, i did the 431 in my dart it runs good for what it is. i dont think it would cost too much more to jump up to a 4.15 stoker from 440source though. i like the idea of using a long rod with the stock stroke but i dont think there is an off the shelf piston for a 400, so the piston cost would kind of rule it out.

Yea, I would probabily build the 451...
440Source has good parts and also Custom pistons are expensive...