use the stock Magnum flexplate there will one hole that will not fit the torque converter by 1/8" open this hole to fit the Magnum uses a neutral balance converter 96-up
You can run a mechanical fuel pump usibypassng the older Vbelt stuff & a cam extension kit from Hughes Racing
Using a Professional Products Crosswinds intake will allow you to use all V belt accessories 78 & back including the correct bypass hose for the waterpump