slant 6 to 318 conversion

I also already have a V8 K frame from a 72 that has been refinished and ready to go, but the car is a 73. Am I better off to swap K frames and avoid buying the brackets, or would there be more issues trying to do the k frame swap?

When I swapped I just used Schumacher conversion mounts. It was quick and easy. Everything bolted up like it was supposed to. A K frame swap would be a lot more work. It's up to you though.

Since you're on a budget, your best bet is to find a 318/904 combo that's complete, and then drop it in. The 904 will bolt right up, your driveshaft will work too. You'll need a radiator, mounts, exhaust, and a few other things depending on how complete your donor motor is.

I swapped when I was a freshman in college. AKA when I was on a budget. It's definitely doable and doesn't have to cost a fortune.