Will this work? I read that the camaro's valves are 1.84/1.50 and 58cc combustion chambers. I can't find anything on the Chevelle's valves except for 1.94 intake. The only problem I see is that the compression might be too low.

Thanks for your input!

 

Why would the size of the valves affect the compression ratio?

3rd gen 350's had 1.94" intake valves and 1.50" exhaust valves.

A 1970 Chevelle could have 1.72" to 2.19" intake valves. The exhaust valves would not be hardened for unleaded fuel use.

 

Thanks for your input. So I should be ok if I Swap the heads? I'm hoping I can get a little bit more power with better flowing heads lol I'll have to look up the number on the Chevelle block and get the specs on it.

 

So you're asking about a head swap, not about valves?

 

Yes, sorry I just realized that I wasn't very clear on my question.

 

TPI heads are better than those old dinosaurs.

 

You did not mention if any porting was involved.
If there is going to be porting work done, then you are better off re-working a set of 305 TPI heads like 416 castings and upgrading the valves then.
There are links in my signature to information about swapping in LS1 style valves and beehive type springs as an upgrade for stock heads.
Valve upgrades without matching porting, or at least opening up the bowl area to match the new seat cut will provide little to no overall performance benefit.

Swapping on the older heads you mention without knowing all the specifics could also provide no benefit, or even cause some problems.
If the engine is bare and on a stand, then you can mock up the new 350 heads on your block to check to see if there will be clearance issues between the valves and cylinder bore. If so, then the dowels would have to be adjusted.
With any valve upgrade (increase in size) on a 305 you should check for clearance issues before running the engine.