New to the forum with a couple ?'s and advice

[Project86]

What's up guys. Finally decides to register on here
I'll fill you guys in on the scoop.
First time chevy owner and I'm loving it. I originally bought an 81 c10 swb. It needed a lot of TLC. I ended up buying an 86 swb for cheap and eventually did a cab and bed swap. And after that I bought a 350 and beefed it up a little. So I'm in the process now to getting it ready to be on the road for a good bit but I'm running into small issues that have me scratching my head.

First off, it's getting to be cold here in south MS. SO HEATER IS MUST!!!
Anyways the heater was working before cab swap. I did remove all ac components since a lot was faulty but I kept the box and very thing on the firewall.
I can turn the heater and blower on by the switch but nothing happens at all. All the connections are wired up as they were before. All fuses are good so I'm going on a bad blower motor or something.

Secondly, couple days ago I accidentally bumped the starter over while it was running.
Now when it's cranked up and running there is a hollow clunking sound coming from the transmission and it's definitely a rotational sound. Kind I like you tap a wrench on the bell housing.
-I'm running a th350 with a 1500 stall converter. I do have a small pan leak and I have to keep an eye on my trans fluid, however the trucks shifts crisp and hard just like it has before with no issues or slipping


Hopefully I can get a discussion started and we call all help diagnose my issues

Thanks everyone in advance!