Installed over the winter Built 2L. 10.4 to1 pistons,sport cams and 40 DCOE webers. After transplant engine fired right up.Engine pulls like a train,hit the brakes and come to a stop and the rev's jump to about 3k .Hate that! Any ideas? Things I've tried, 1st checked vacuum,it was low. Then added vacuum canister, no difference. Removed canister and installed elec. vacuum pump, no difference. Blocked engine vacuum and w/vacuum pump only,no difference.I'm starting to think this may have nothing to do with engine vacuum or brakes?Really frustrated.It's been almost a year since it went into the garage.I need to DRIVE!