67 GMC 305 V6 swap to a SBC 305

[406 Q-ship]

Originally Posted by bigwil86

Yea, I'm in the process of trying to find a 71-72 c10 donor truck now. But as for the 305 v8 I'm building its a 305 with 4 bolt mail splade caps for added durability, speedpro/king bearings, 305 X-beam rods with dome pistions, 200cc ACR aluminum heads with 202/160 valves, 1.6 aluminium roller rockers, screw in head & rocker arm studs with polylocks, Jegs 468/488 lift cam with 110 lobe separation, dual plan weiand highrise intake with 650 cfm holley. I run this exact same set up a 83 S10, I know the GMC is a bit heavier so the gas mileage may fall off a bit but after the motor is tuned the numbers are good.
Posted via Mobile Device

That combination will never get 22 MPG, even in a vega. The 2.02 heads will NOT work on the small bore 305 (valves will hit the cylinder bore), 200 port is the size you run on a really healthy 350 and bigger not a 305. That Cam is HUGE in a 305. Do yourself a favor, if you want that kind of a combination do it to a 350. Even a 350 in that combination will be a bit lazy bellow 2800 RPM.