Hi everyone. I ended up putting a 1968 Pontiac GTO 400 engine in my 1968 Pontiac Firebird. I rebuilt the entire engine and reused the original cam and heads. All new bearings and piston rings. It's got a 4 barrel Carter carburetor, Hooker headers. Rebuilt the Saginaw 4 speed transmission and has a new clutch. The rear end is original as well. That being said the car and motor run really well. The only problem I am having is I think I should have more acceleration then I do. From the stop position I punch on the gas and it doesn't have a real fast acceleration. It sounds mean and tough but no get up and go. The car shifts fine and runs well at high speeds. I need to know what the steps are in finding out why I am not getting a lot of initial acceleration in first gear. The initial punch is good but dies off quickly and the rpm's go really high so I have to shift into 2nd and then 3rd. The engine has been running for about 2 months driving on the weekends. I'm trying to figure if this is just the nature of the car with low acceleration or if I am missing something. I don't even know what information you need so let me know. I am hoping it is a simple fix or if I need to change/upgrade equipment? Thanks in advance for your help.