If I understand correctly, matching the MA5 to the 5.7 is as easy as a Dakota 3.9/5.2 to AX-15 bellhousing. I KNOW the MA5 shares the same trans/bell bolt pattern as the AX-15. I don't know the length of the input shaft compared to the AX-15. You may need an adapter there.
Depending on clearance, I don't know if you'll be able to use the Dakota style clutch slave cylinder, or a hydraulic throw-out bearing.
You would use a Dakota sized flywheel, properly balanced for the 5.7 and matching pressure plate. Then use a clutch disc with the MA5 splines. Can't think of the name right now, but there is a clutch company that will custom "mix and match" the clutch kit for your needs.