Crate engine for my 65 C-10

[AlexM]

Hi, Im' thinking of putting a crate 350 in to replace my worn 350. I would like to get one with the Vortec heads and a roller cam so I don't have to use special oil. So far all the ones I see like that have the oil dipstick on the passenger side. It looks like it would be a real tight fit because the heater box and fan motor are right where it comes out. One solution would be to use headers and a flexible dipstick that comes up real close to the valve cover.
What make and model of block hugger header will work in the truck without hitting the motor mount? Also, if I switch to headers I will have to get a different mount for my power steering pump. What is a good setup for use with the short water pump?
Thanks
Alex