Re: 396 to muncie 4-speed bell housing
You're probably going to want to search here, because there are a lot of good threads about setups for BB and stroked SB.
The factory BB setup used a bellhousing with a casting number ending in "621", which housed an 11-inch clutch and 168-tooth flywheel (vs the 10.4-inch and 153-tooth used behind most SB). You can look for a decent 621 on ebay or at swap meets, but they sell between $100 for one that may have some issues (small cracks, stripped inspection cover threads, etc.) up to $250 or so for a cherry one. Doesn't make a whole lot of sense, because the bells are not date coded, but some sell for some pretty decent money.
There is an alternative OE bell, the "697". The only issue with that one is that there are two positions for the throwout pivot, so you have to be sure to use the correct one.
There are now reproduction "621" housings available, and I have read good things about them. Just about any repro parts vendor like Ground Up or Rick's should carry that.
The flywheels can be hard to come by used, but your looking for a 168-tooth flywheel for an internally balanced (vs. the externally balanced BB like the 454). You can get them in different materials and weights, but for street driving it is tough to beat a good steel OE type flywheel.
Clutch choice really comes down to how you plan to drive the car, and what kind of build up you're doing on the engine. I have a McLeod Dual Performance 12-inch clutch, which is just a little bigger than the stock 11-inch, but fits within the 621 housing. It is bar none the smoothest, strong clutch I have ever owned, and because it is a diaphragm style, won't wear out your leg on the street. My BB is pretty mild, roughly equal to the L34 396/350, so this style clutch is enough for me. Plenty of guys running higher torque engines are running dual-disc clutches.
You also need to make sure you get the throwout fork that works with 1st gen F-bodies. I have the part number in my notes here if you need it, but it might come up in a search here. It is still available from GM.
Start with a search here on "621" and see what info you get. There's plenty of info on different setups, including which starters work with which bellhousings.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!