Here's a list of about what mine cost two years ago, when I swapped:
You'll pretty much have to build your own "kit" for a Muncie (4speed)
The 5 speed kits are pretty close in price to each other, depending upon who you use, but at over $4200 (what I was quoted) was quite a bit more than I wanted to spend.
I just did the swap two summers ago (from a TH400)--here's a rough idea of what the Muncis swap cost me:
I spent about $700.00 on a rebuilt M-20.
Hurst shifter (including installation kit) for $330.00...
Flywheel $250.00 (I had a stroker, so I needed an externally balanced flywheel--they are cheaper for neutral balance)
Clutch and pressure plate kit $299.99..
Swap meet bellhousing (621), clutch fork, flywheel cover...$225.00
backup switch and wiring was about $100.00
Clutch/Brake Pedals about $70.00
Linkage kit was about $99.00
Total of about $2100 there (about half the price of the overdrive kit + the fun of parts hunting--but not everyone enjoys that part!).
I did have a few other expenses, which I would have incurred anyway, even withthe overdrive "kit" because I was converting from a TH400, so I needed a crossmember and driveshaft. You would not have needed these extras if tyou had a powerglide or TH350 trans