318 covid 19 build

So, due to being able to put hundreds of hours into my 68 fastback project. I’m WAY ahead of schedule. Which may create an issue. The plan was to move the short block from the race car over and build a new “serious” short block for the race car. I have the closed chamber eddy heads/airgap/race demon to put on the new project. So here’s the question. I have the original 318 from the car. How bad would the 318 perform. I would just check the bottom end and I think the best parts I have in my stash for it would be a stock 340 intake, the eddy closed chambers, a stock 68 340 auto cam and the original 68 340 carb. It would have either 340 exhaust manifolds or headers. It would cost me a gasket set. What do you think teeners?