New Engine, Different Tranny???

I would do a couple things..the 198 and 225s are close enough to not notice much in a swap..But, you can swap in a cheap 4sp OD trans and floor shifter, and add some rear gears, and it will be a bit more peppy, and get better milage. The whole deal could prob be done for under $300. Then you can consider the power levels and engine swaps..