4 sp. bellhousing help

Im trying to convert my 64 Plymouth Valiant w/ column shift 3 speed(Slant) to a floor shift manual 4 speed. I found a true 4 speed from a 64 or 65 locally. What bellhousing do I need? Are there any identifying numbers to help me with potential options? Any input welcome. TIA
This topic is covered very well on the Slant 6 Forum; 1st article under Articles. I converted my '63 3/tree to an A-230 3 speed (floor shift) and used the original bell. For an A-833 4 speed you will need one of the following early cast iron bells: 2463025, 2463027 or 2468431. They show up on Ebay, this forum and the \6 forum. Good luck.