Bellhousing help

[Sooner_Sparky]

Guys I'm new to the forum and need some help. I searched forums but didn't really find my answer. I'm restoring a 1970 Chevy SWB. I have a 4 speed Borg Warner super T10. I planned on using a Lakewood bellhousing but it's hitting the trans crossmember. For strength purposes I don't want to remove crossmember. My question is what bellhousing can I use for the tranny. I know that the truck bellhousings have a bigger opening (5 1/8 ...I think compared to car 4 speed 4 11/16). I will be using a 10.4" clutch. I've heard that pre 68 trucks used smaller openings. Is this true and if so, are they the same size for my t10? Any help/suggestions would be greatly appreciated.