Gotcha. I read automatic transmission and it all went the wrong direction for me. On the bellhousing for manual transmission, others will jump in with more help but in 54 the bellhousing was angled at the bottom in somewhat of a V shape and had different motor mounts because of it. The earlier years, the bellhousing was straight across and used a style of motor mounts to match that design.Putting a 54 bellhousing in your 49 may be trickier than you planned for. Surely someone here will have an eariier bellhousing with the 3 speed stud. So sorry for the guided tour of "left field"
