High compression 360 set-up

I would run a compression test first. See where your cranking numbers are. This will give you a good idea whether the engine may run on pump gas. Just because it has domed pistons, doesn't necessarily mean it won't run on pump gas. Generally, when piston companies throw out a compression number, it is one using the smallest available chamber. There's a good chance your compression is lower. Run the compression test and post the numbers. You'll have a better idea then.