I do not know for sure, but wouldn't the intermediate shaft be fine as is? It is in a machined bore with a bushing, gets driven off the cam gear and is held in place with the distributor and hold down? Should it matter if there is an oil pump on the side or not? Seems to me it shouldn't. I think the early Pro Stock hemis had dual distributors and dry sumps.
All my twin mag distributors have a one piece long shaft with a gear added not a 2 piece in the past ive done a modified shaft where I cut the bottom off and ran it with a standard block bushing plus shims