I’m thinking about having the 305 ci (140hp RPO=LG4 with 165tkm) completely overhauled and “optimized” at the same time (spin, cam, header possibly carburetor?) control unit/cat is not available thanks to export version or a “turn key-ready-crate engine” with 350ci from GM-Performance (290/330HP?), which would be more likely to be offered or is this just too naive again? maybe this could be the case. THM250C is also overtaken (reinforced?) because it’s a bit “moist” *g* OR just leave it like that and maybe only a few headers on it? P.S.: didn’t want to post into the Buick motor thread, since actually other story