I'm pulling out my 305 and looking to put something else in. I've got a clean magged 400 but need bored etc machining. Crank looks good but that's about it. I have an intake and carb and that's about it. Would be all street. Looking for 400/400. But before I get into a bunch of machining cost have been thinking of putting a used 5.3 L in. Mostly wondering basic cost. Labour for me is no biggie and I'm fussy over details and very creative for solving problems