Any love for a 373 SB

The 284 Mopar hydraulic is still in my humble opinion a awesome 340 camshaft. But it likes gears and it needs to breathe a mismatch for stock manifolds. As good as the 340hp manifolds were they're still a major cork as the RPM range climbs the problem becomes more pronounced. I would keep the cam lose the manifolds and run a 355 with the 26-in tire. But really better yet a 391 yes it'll be whining a little bit at 65 to 70 mph but for a 340 that's just a sweet song . But if you move to the 358 stroke rear end gears 355 no problem great combo. Also by moving to the longer stroke you will raise the compression enough that a ironhead will be needing a spot on tune and good fuel! The 340 stroke and the same setup will be quite a bit more forgiving and premium pump gas friendly.