NV4500’s and Laying Frame

[bigtexasrob]

My crossmember section began today, which means soon I will have my front suspension off and will have the easiest opportunity to address my transmission crossmember (as I understand it must slide out the end of the frame with the crossmember removed). ‘74 C30 350 with the “four speed” (3+L) manual trans, swapping to 6.5 NV4500. Will my NV4500 mount to the stock transmission crossmember? Will the truck lay frame on stock trans xm? Should I/Do I have to switch it out for my 93 NV4500 crossmember? Thanks in advance.