71 dodge demon engine questions.

hey guys, im converting my 71 dodge demon 6cyl. with auto tranny to a 340 4 speed car and have a couple of questions reguarding the 340 engine.
1. Who makes the better engine mount swap kit from 6cyl. to V8?
2. the AVS carb for the 340 is a #4401 for a auto trans. is there any difference between the carb for the auto trans and the carb for the manual trans?
3. And also any suggestions on cam?

Thanks for the input and advice.