what ex gaskets to buy

good additional info & very much appreciated for your time/effort. they changed the rules to allow headers, a specific one which was not too pricey but it requires a $390 robbmcperf starter plus the block needs to be ground & I think it might interfere with the kickdown linkage on the side of the trans. I wanted to wire it back but people said a reverse manual VB would be a better way to go plus the ex pipes are limited to 2". all of this had me hold back on a header decision. can I get those cometic gaskets in the pic with just the info on the pkg in the pic?
Should be able to order by part number. That's how I order them.

What does a Robmcperf starter look like? What starter are you using now? Where does the block need to be ground? I don't know much about auto transmissions but I don’t see why you would want less than max pressure for circle track.

The 25 hp difference is comparing manifolds with 2" vs headers with 2" pipes.