You may try and find my old post, some info there, im going to match my stock upper, to a bigger tb, and clean up the upper ports, i have some grinding stones, and abrasive rolls, like sandpaper rolls to do the final cleanup, i was told not to shape the port into a "bell shape"....let me know how it goes, i have my 65mm tb sitting here, just waiting for it to cool donw before i go yank the upper, or i might shove a towel in the upper, and do it on the motor.
good luck...
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Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer 
Race weight: 3,120
E.t-13.57 with 26x10.50's e.t. streets. 1.88 60'
mph- 99.92 mph
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