Just installed my complete drop in MMI A4 3 months ago and it was the only way to go. I thought about a short block to save some money
but have to say it would not have been worth it with all the corrosion
and unknown things the PO has done to it. I'm betting this Moyer A4 will last another 20+ years like the one that I just pulled out. Go for it and you could even chage it your self instead of using the yard to save some money
. It was very easy just attached a chain hoist to the boom and out she comes. Number all your wire that you take off!