305 high output heads on a 350 sbc?

-My question is that I have a engine from a 1972 Chevrolet C10 this is a stock 350 4bolt main with a 4 bbl and the compression ratio is 8.0:1, I heard that you can install a set of 305 heads to bring up the compression ratio. I just so happen to have a set of 305 high output heads (cast #416) and I was wondering what work I have to get done to the heads so they can perform good on this engine. I also have a comp cam xe262 (.462/.469) it also has a edelbrock performer air gap intake and a bunch of other goodies and I'm hoping to squeeze enough power out of this block as I can without spending too much. I'm open to ideas or suggestions ???Port and polish your existing heads, and ask if it's possible to mill them about .001 or so to boost compression. Probably your easiest and cost-effective solution.
It appears they will bolt right up, no mods needed. However you need to look at your setup. If you have dished pistons then you are ok. Otherwise it may up your compression ratio too much. You need to figure out how big the chamber is on the new heads. Compared to the old ones and do the math to figure out what the new ratio will be.



Also if your ratio goes alot higher, like 10 to 1 then you are going to have to use premium gas. You could use a thicker head gasket to lower the ratio a little to a more street friendly 9.5 to 1.



The only thing you should consider doing to the heads is getting larger valves. The 305's generally had smaller valves then 350's.