"416" 305 heads on 307, anyone do it?

[andymarkv]

I finished my friends farm truck.....well enough for now! But I'm planning for next year!
http://67-72chevytrucks.com/vboard/s...d.php?t=409864

Currently it has an edelbrock 600 carb/performer intake, recurved HEI and small 206/212 comp cam http://www.summitracing.com/parts/CCA-12-230-2/ on the factory 307 motor. It is better than it was as a stock 2bbl motor, but its still pretty gutless.

I have read where swapping on dirt cheap casting number "416" 305 heads with 58cc chambers and 1.84in/1.50ex valves is a good way to up the compression and help give these small displacement motors more low end.

The motor is in great tight condition. Cranking compression is 120-125pis on every cylinder. Swapping the heads would be an easy weekend job. Plus I'm sure if I look hard enough I can find the heads really cheap!

Has anyone actually done this? I'd like to hear real world feeback on the results. If it is a major seat of the pants improvement, I think it would be worth the effort. But for a small increase, I doubt I would bother.

I am also curious with roughly 9.3:1 if premium 93 pump gas would be required? The truck is only used for farm work, so heavy 2500 pound loads and not that uncommon. I would assume heavy loads would increase the chance of detonation.

Just looking for anyone who has done the swap and what their thoughts were on the results. I have searched the net and found a TON of people talking about it, but no replies as to driving impressions afterwards.