Replacing original trans.

it depends on how original you want it to look when your done. if your handy, any 904 will do except lock-up. you can use the original convertor if you change the input shaft and stator support. that just leaves the nuetral switch and speedo cable. you can change the rooster comb on the valve body for the single pin switch. speedo cable iam not sure, but someone here will chime in.