Where to get heads?

Was doing the valve seal replacement on my 93 D, and couldn't get the valves to stay up on the back head with the air compressor. Kept hearing and feeling air coming out the plenum, so figured that an intake valve was burnt and not sealing well. Well, all 3 cylinders did that to me. Noticed what looks like a crack around one of the end head bolts.

Does anyone know where to get either a set of remanufactured stock heads, or a set of upgraded or 3rd party heads that will work on the 6G72 SOHC engine?

Thanks,
Scott

I have a set of heads that I had rebuilt with new valves, then reinstalled them with an aftermarket timing belt. 20K later the belt broke. I had another set for spare, reinstalled with a factory belt. The heads have 3 bent valves in each head, will sell for $50.00 plus shipping. I hope this can help you in some way.