engine fitment

this is a 65 barracuda factory 273 car, i am up grading to a 360 with a 727. the pictures show mock up only. right motor mount is still the 65 273 mount. the left motor mount is the interlocking tab style mount from a 78 dodge truck. motor sits level with car left to right. the right exhaust manifold is from a 340. the gap between the right manifold and fender skirts is tight. before i blasted the paint from the engine bay, the paint in that area was fine no charring. what can i do about this gap? any thoughts.

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That's actually a pretty good gap- about what I have with a Magnum manifold. I've seen them a lot closer with "ribbed" manifolds, to the point where people have hammered the fenderwell for clearance. You've got room for engine movement, so I think you're good.
You'll never be able to easily remove the exhaust manifold if you use studs in the two end holes- you'll need to run standard bolts; so remember to seal them well since they are wet holes.