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Well I'm going to give it a shot & find out. 12.50 or bust!
I will be able to bracket race it either way.



do a pocket port on the heads you want to use...
thats real easy to do.... the conv will make a big
difference as well as the chassis set up... if your
looking to go 12.50 in the heat you need to make it
run 12.30 in good air and I'm sure some of these guys
are telling you the best they ran... you need more
gear but use what you have... the 509 might get close
with the porting... also do a match port to the
intake and heads... with your die grinder knock out
any chunks in the runners and just smooth up the
short turn on the heads... if you can have the heads
milled some to clean them and make them flat will
help... get the front of the car as loose as possible
so it lifts and get some rancho 9000 shocks for the
rear and I think you'll get there.... use your 850
carb




Good advice but make sure you use the 516's so you raise compression with the closed chamber heads. Use at least a 2.14 if not a 2.19 intake valve and open up the pocket accordingly.
Like he said just clean and polish the short side radius but try and open up the area a little on both sides of the valve guide boss.
Use those 4.30 gears and that thing should run great with the tunnel ram.