Gm crate motor what lower rad.hose should I ask for?

[Hawssie]

I am installing a Gm crate motor in place of a 307 in a 1970 C10. Well the top radiator hose looks to fit fine but the bottom radiator hose isnt really even close to fitting. The problem is the serpentine belt set up. I did try a 89 blazer hose since I figured its still the old style truck but if I remember correctly its about the first year to use the serpentine set up. Well it has a 1.5 size for the rad and mine is 1.75 same as the water pump. I know I usually keep trying or see if I can scrounge around in the back of a parts store but I was hoping someone has figured this out already. The parts store(O"Reilly) didn't have anything in a flexible design that near long enough with 1.75 on each end.