I have a 94 bonneville and plan on swaping in a 92 engine. I know I need to change the intake manifold, and exhaust manifold. Will I be able to put the 94 (L) heads onn to keep the EGR valve?

The 92 is an L, the head will fit. I'd use the short block only.

You don't need the heads to keep the EGR, but the 92 heads have a lesser valvetrain design than 93-94.

Should I change heads then? I bought this on ebay, and am debating if I want to do the extra work, whould it be worth it?

sorry, heres the link
http://cgi.ebay.com/ebaymotors/ws/eB...982818212&rd=1

I got the heads off, and there is a little buildup of carbon as well some grainy substance in the combustion chamber. What is the best way to clean this up? I dont want to damage anything, but would feel better putting everything back together shiney. Also which push rods should I use, the ones that match the heads, or the ones that match the block (I am using the heads off the 94.)

The pushrods should be the same...

Use simple green and a nylon brush, maybe brass.