BB vs SB frame mounts/location

[TLoz]

Hi everyone,
I've got a question for the masters. Is there a difference between the big block (454) engine frame mounts on a 1978 K20 and a small block 1978 K20? The frame I've got had a small block in it. I've got the cross member in the only bolt holes drilled, the t-case/tranny bolted together and the inspection cover rods running to the mounts and I believe that I'm setting forward about 3 to 4 inches to far forward. Due to front drive shaft being long. Many thanks! Tom