Do you think those will work ok for a later year motor like i have
Yes.
The exhaust manifold bolt pattern is the same on most Pontiac V8 engines, except the 265 & 301.
And the outside dimensions of the 350 thru 455 engines are very similar, using the same motor mounts.
So, unless you have a late '70's block, which uses only the 3-bolt mounts, most any 350-455 D-port head engine should bolt right in & use the same headers.
