I need headers 101

[hpcgmc]

I'm getting close to buying a new motor, and realized I need to figure out what headers to buy. I'm not a motor guy and never had headers, but from what I read, the issues seem to be ground clearance, ability to change spark plugs, ability to run plug wires without melting them, and maybe transmission or clutch clearance?

I will probably install a 350 crate motor. The truck will only be dropped 2/4 or at most 3/5, so ground clearance shouldn't be a major issue. I've got the stock 4 speed trans now, but expect to eventually replace this with a different 4 speed. Currently no power steering or power brakes, but expect to add these eventually.

Lastly, this is a low budget build, so I'm hoping to keep the cost down.

All ideas appreciated!