inline 6

What’s the Most inexpensive and and efficient method to upgrade inline 6 to 300-350hp ? What’s parts do I need, and what route should I take? I would like to do piece by piece and still drive the car every now and then while adding parts. Or should I just V8 swap?

Having never dealt with turbos, I was wondering if any body knows of a kit that would work with my 250ci with minor modifications.

I am very limited with my budget based on how much work needs to be done on the car itself. This got me to prioritizing. I eventually want solid lifters so I don't want to just get a better hydraulic cam, but at the same time I can't afford a solid cam, solid lifters, and an adjustable rocker...