new 406ci in my 67 Firebird
new 750cfm edelbrock carb
new holley pump gas and regulator
new spark plugs, wires, rotor and distributor cap
car ran well for 3 months but just start to bug over 4000 rpm. I can use the car without any problem as long as I dont accelerate strong over 4000 rpm. I don't know if it's missing gas or sparks.
Does anybody have an idea where I should look first??
http://firstgenfirebird.org/show/closeup.mv?CarID=341
Montebello, Quebec, Canada