My '75 Scamp 383 Build

I'd dingle ball hone that one and let it rip. Now......here's food for thought. I know this is a budget build, BUT, I would consider having the block decked. Normally, it runs between 150-200 bucks. These old blocks were almost always crooked and tall. Getting it straight and the decks parallel to the crank center line makes for a good foundation. How far up in the bore did the pistons come up at TDC? If it's close enough to zero deck height the block, I would do it. The cost for decking is the same regardless. That could actually add a little power and possibly give some resistance to detonation. Lastly, I would "look" at having the heads milled, just enough to assure good gasket sealing. Have you inspected the valve guides and seats yet? There's "not much room" for error there. That's another corner "I'd not cut" if it needs guides and seats. Expensive, I know, but you don't want crappy heads.