Hey guys! I have a MINT 1980 440 drifter that im having issues with bogging at full throttle. I live in southern Wisconsin and just south of me there is a race track that they have been racing vintage leaf spring sleds at. Well I entered it this last Saturday and had major issues. I was battling the sled all week on trying to get it to run right. I was changing the jetting but everytime the temp would change it would run crappier and then I would get it to run good again but I was also at my house on flat ground. Basically Friday night (about 3 degrees outside) after I messed with it all night I seemed to get it running good. Saturday morning it was about 30 degrees and it ran like crap, rejetted it and it seemed to run fine. Got to the track that night (went down to about 10 degrees) and of course it ran like crap again. Rejetted it to what I had the night before and it ran real good on flat ground. The track has a pretty decent hill that you go up and down twice (roughly 150-200 feet up). For the most part it was running real good on flat ground but coming out of some corners it would bog down bad and then going up the hills I would lose basically all power, I was lucky to reach the top most times. Is there anything you guys think I can do to get it to run better, im at a stand still here. I really don't know much about jetting so I could use some help with that if anyone has like a chart or something. The plugs are new, compression is at 150 in both cylinders, carb was cleaned multiple times, fuel tank flushed out, ran all new fuel lines, im just completely lost and I really want it to get running at full performance. Also if I get this figured out I would like to regear it to have more acceleration than top speed, were lucky if we get up to 35-40 mph and this is all im doing with the sled besides bopping around at the house so the question is does anyone know where I can get new gears and a chain from or are they somewhat universal with other brands. I would really appreciate the help. thanks guys!!