SBE 318 basic rebuild +CAM , INTAKE, HEADS, expectations?

Do they fit with stock rear suspension? 8-1/4 rear end?
On a 8" steel wheel?

Further
my headers are a PITA to take off the driver side routes under the steering and there is no way the big old starter could be removed, I assume it's a older long tube design.
They are in bad shape and I think I have to replace them

So what SB header does clear a 74 duster with power steering ..
Long or shorty headers?
No guess work
I moved my springs in about 3/8", yes on a 8" wheel... but it's too tight to the body for my liking... i also have a 62 b-body and i'm just a spy on these forums :) so... no idea on a a-body.. plus i have 4.57 gears and i wanted a big diameter to eat some of that up.. otherwise i would have a smaller tire