I will just swap out headgaskets. Actually, I will also change one of my rods that was rebuilt when my car blew a few years ago since I have a brand new Crower rod sitting in my garage. I will also change pistons rings while I am down there and check the clearances on everything just to be on the safe side. As for performance, I will put a thinner headgasket, install my 850cc Kit and Tomei 270 high lift cams and solid lifters to allow me to rev to 8500 and take advantage of the power curve. I then will have identical mods like the Supra dyno sheet I posted except for my cams. We then can compare the two and see if my higher compression engine will spool up faster than the Inline 6. Not fair since one is inline6 and the other is a V-6 but we still can compare.