500hp 408 with Hi-Po 340 Manifolds?

Im am more than willing to extrude hone the old dinosaurs. I currently have TTI's and column shift on my stock 74 cuda, it has been nothing but a pain. From starters to servicing not to mention linkage. The original motor is coming out in favor of an 89 based 408. I do have a set of comp solid roller lifters and the block has already been clearanced for them but something about solid roller and street just doesn't sit well with me. I think ill give IMM a call and see what he recommends. Houston has 93 octane pump gas so that's a plus.