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Not sure I can relate to this 'exactly' as my SPF has a Tremec 5 speed as standard . However, in my 65 Mustang K code I converted from a 4 speed toploader to a Tremec 5 speed using a conversion kit from California Mustangs (other suppliers have them too). It consisted of a 1/2" adaptor/spacer to the bellhousing , new crossmember and some other minor adjustments. However, the trans was also 3/4" longer with the output shaft and the driveshaft had to be shortened 1-1/4 inches ( spacer as well as trans length) as well as changing the speedo from gears to a variable ratio box. As I said, this might be apples and oranges to what you are going thru or have to do, but suspect that the driveshaft will require adjustment in length as well as speedo gears and perhaps some other misc items too. The 5 speed vs 4 speed made a big difference in performance from 0-60 as well as when in 5th gear on the highway and was well worth the investment for improved performance and overall driveability. Good Luck. Bill.
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