65 chevy truck sm318 to m20 swap

[70chevrolet]

New guy here. Need some help if possible..
Just bought a 65 c10 shortbed with 292 and sm 318 Muncie 3-speed on the "tree"...it is the one with the warner overdrive tail shaft... Looking to swap a 350 with Muncie m-20. I know I got to change out the passenger motor mount to get the small block in there, so I got tut covered.. And I already purchased the m-20 trans so my heart is dead set on that.. I know the swap is pretty direct but haves few questions for anyone who may have "been there/done that"!
1. The truck is low tunnel. Will I have to modify the trans tunnel (except for cutting the shifter hole)?
2. Will the bellhousing, cross shaft, Shift fork & other linkage from the sm318 work with the Muncie m-20?
3. Can I run a bench seat without moving the engine forward? As I know the floor shift on a m20 will will be a few inches farther back. I will be running a hurst comp-plus shifter?

I know this is a ton of $hit but I could really use any information that you all may have to offer to save me from wasting my time and money...
Thank you in advance!
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