Big block duster pain in the A$$

I got a Scamp I've been debating on a 440,,,Simple or a 451. Better fit,more power
MORE money. Still undecided. It's gonna be a daily driver 6-8 months a year. I'd like
to use manifolds,,No leaks,but not sure what'll fit. The green 69 looks like its got plenty of blower motor clearance. Nice cars,all of em.