I have a 7 mil T-Rex drag ported by the legend Rudy Kurtz. It has a perfect 73.50 bore and pistons on it. Pistons sold with the block, head, reeds and intakes. One intake boot has a hole in it. I would advise getting a new one or set. Asking $1200.00
Also have 10 mil trenched cases. Setup for a 74mil bore block. It has a crack above the front sprocket but is in good working order. I can weld that up if someone wants it fixed ($50). Asking $300.00