My .02....
If this is the complete level of rework(as in....... you’re changing only those items, and will run 3.23’s)you’re not going to get there.
Especially if you’re serious about
yes, I really want to focus on 4 items. Heads, cam, converter, gears (but not 4.56's). You may very well be correct, I may not get there, and that's ok.
