i got a second hand marks 4x4 adaptor and when i got it it had a 10 spline adaptor?. most ls1 are 26 spline?. aprently the early adaptors came out with 10spline. but to match the clutch up its all getting to hard. people saying the crank is shorter ect. im guessing the adaptor may be an old 350chev conversion as the bell housing all bolts up. has anyone been down this road. to get the 26t adaptor from marks is $460ish.