this will certainly bring on some "expert" criticism,but,if it still has the stock,low compression pistons in it,and 452 heads,that 750 is an awlful lot of carb for that engine.
i know,i know,it would have had a thermobog or quadrajunk on it originally,with great big secondaries and a 750 or 850 rating. but,that is with tiny primaries and those big secondaries only in use when she was on the floor. i'm just sayin.....