Plan is to get Langdons adapter and put a THM350 behind my '54 3100's 235. Does anyone know if I'll have to modify the floor other than for a shifter hole? It's got a flat floor. Also, anyone have a pic of their DIY rear transmission cross-member? I need a couple of ideas besides buying one.
Thanks

'53 BelAir 261 3spd/OD 4dr
'54 3100 235 3spd
'79 C30 with a '51 235-'57Bellhousing-'67SM420-14bolt dually
'89 V3500 350/465/205 SRW CC
One Chevy just isn't enough.