No Ballast, hot coil

If you "actually" have a coil made for "no ballast" there should be no problem. Just how hot does it get?

Otherwise, you may be mistaken that the coil needs no ballast. You have a brand/ part no?

You say you don't have much money, I'd do one of two things--

either fix the wiring, and wire up a stock Mopar ballast, or adapt a GM HEI module

If you wire up a Mopar ballast, the first thing you'll have to do is figure out whether the NAPA box you have is a so called "5 pin" or "4 pin" box

Four pin boxes MAY HAVE 5 pins in the connector, the 5th pin is just not connected.

A 4 pin box can use EITHER a 4 or 2 terminal ballast --it's just that the other half of the ballast is not connected

A 5 pin box MUST use a 4 terminal ballast.

You should be able to fix the wiring, we can probably help walk you through that. It's only two wires, coming from the key, the "dark blue" run/ ign1 wire and the brown resistor bypass "ign2" wire. They originally went directly from the ign switch through the bulkhead, to the coil resistor. Dark blue goes to the "input" end of the coil resistor and also supplies the regulator, and brown goes to the coil + side of the resistor.