Wheels, Tires and Engine Issues

[OSE_NERO]

I have a 1981 C10, single cab long bed with a Goodwrench 350 crate engine (installed sometime in the 80s; family didn't know it was swapped in and thought it was factory when they sold it to me).

So I'm looking at getting these wheels http://www.bbwheelsonline.com/toxic-...30621250N51MB/

Along with these tires http://www.bbwheelsonline.com/lexani...LXST202025040/

I'm planning on pumping the fenders or making a wide body fender to accommodate lowering it over them, but I was wondering if they'll fit ok on stock suspension? I also am thinking about a 4"/6" drop to have the fenders look like they're on top of the tires. Is that too far of a drop?

Last query I have is when I drive my truck for a while and it warms up, when I turn it off, it's hard to start it again for a while. Any easy fix?