[sweet70beast]

When I was mechnicing years ago, one of the older techs used a 1939 Chevy car trans input shaft as his clutch alinement tool. He used it on as new as 98 Chevy\GMCs with the NV4500s in them. The spline count should be the same but I don't know if the input shaft in the same length or not. The center hole on the 420s bellhousings are to small for the 4500. You could find a bellhousing from a mid 70's and up truck because they had enlarged them buy then so they should go right on the trans. I would think they should work with your clutch and pressure plate. Depending on the clutch fork you have, you may have to get one that fits the new bellhousing aswell as a throwout bearing to fit the fork. Hope that makes sense and it helps.