some info on a 440

The guy I bought it from said it ran perfect and that it would only overheat on hot day but other than that he never drove it cause of gas prices. Its been sitting a while. Its sitting at his house I finally got it started yesterday put some gas and had to tap on the carb a little for it to work. I should have let it warm up a while but wife wanted to head home. When trying to drive forward it just reved and rolled a little when in reverse it drove fine. I checked the trans fluid and looked clean and didn't smell burnt. I was not warm at all so I'll let it run a little before I drive it next time. The truck originally had a 318 with a727 torque flight . The big block 440 was from a 68 charger. Say the trans was rebuilt and has the reciet. Engine has a holley double pumper