It was overall sloppy but I discovered later that it needed a full gasket between the trans and the bellhousing. It was mostly the cluster gear shaft/case leaking. Later units only used the gasket behind the bearing retainer. My 2A has a "F" head engine same as your 38A1 but it didn't leak too bad so I left it alone.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine