K30 with a 6.2

I have posted in the Garage section but I was thinking this may make a better place for my stupid questions about my 1982 K30 with a 6.2.

Here are todays
I has a new pump and runs pretty good. Should it smoke? I mean it doesn't smoke at all but I haven't put alot of load on it but accelerating it doesn't ever smoke.

The previous owner put on a puroilator fuel pump in right after the tank switch and unhooked the mech pump. Is there a reason I can't just run both? More or less use the elect to feed the mech pump? I thought it would help prime the filters and such after a filter change.