Help! 360/4-speed conversion in crisis!

don't worry in my youth I was in a hurry switching from a auto to 4 speed and did the same thing /never had a problem just make sure the input shaft doesn't bottom in the back of crank. also get a dow pin and put it in the trans the block will rest on it and wont move after the bolts are tight. also your oil filter threads look striped on rusted you might want to take a look at it