One thing to check is the coolant ports in the heads. On my original 93, there was a vast amount of casting flash, which would create a hotspot and * slight restriction in coolant flow. I probably could have left well enough alone (and should have had I known the head was warped), but it irked me seeing that and I knocked it out with a dremel.
If the assembly is a 94 it should already have the roller pivot rockers installed. It also *could* have the walled intake manifold that I heard is not the greatest to have when it comes time for P&P. 92&93 L67s do not have those walls in their manis.
EDIT: re-read your post. Yes the 94 rockers will fit on the 93 heads. It was 92 that the heads were different IIRC.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.