273 for 318 swap advice

Timing is set at 12 deg. static and totals around 36 deg. mechanical. Add about 12 more deg. for vacuum advance. I fished around for a short slot advance cam for the distributor specifically to run a lot of initial timing for low end. The kickdown is set for WOT and it opens all the way, however the tranny up-shifts waaaay too quickly and doesn't part throttle downshift as I'd like, so my next step is a shift kit. My choice is either a Transgo TF2 or the B&M transpak......any suggestions?