I have a 454 with square port 188 heads. Cant seem to find the coreect head gasket number and my old one has no visiable numbers on them.

Thanks

Do you now what Gen engine and is it overbored at all????

These should be the ones you need as long as it isn't overbored more than about .030. Might even work with more overbore. Work with all Gen blocks. I think you just have to do a simple modification for a MK IV block.
http://www.summitracing.com/parts/FPP-1037/

Intake gaskets # if you need them as well
http://www.summitracing.com/parts/FPP-1211/

You might be able to call Oreily's at the Lake to see if they have them or can get them by the weekend.