Small Block Chevy Heads?

Hi, I'm buying a '72 el camino with a 350 SBC minus the heads.

My question is - What year(s) heads can I put on? (example: '68-'76)

Thanks. Kevin

'55-'86......
If you're interested in affordable iron heads that will support 400 hp on a 350, take a look at these little jewels from Racing Head Service......
http://www.amazon.com/Comp-Cams-1240...er+heads+12403
Fill them with this head improvement kit (one kit fills two heads)...
http://www.competitionproducts.com/H...ctinfo/851226/
These studs.....
http://www.competitionproducts.com/A...info/134-7101/
And these pushrod guide plates.....
http://www.competitionproducts.com/M...tinfo/42151-8/