well at dragstrip lastnight and car has been running perfect - but i noticed when i brought it WOT above 4.8k it felt like it was stuttering a bit - almost like it wasnt getting enough fuel?

car was a rebuild salvage and sat for almost 2 years without moving so im trouble shooting it a bit - just wondering what u think it could be

it had a bad hesitation and stutter when i was rebuilding and breaking in - turned out had severly clogged fuel filter and bad plugs - after that car ran perfect but last night at track when i was bringing it up it felt like it was not getting enough fuel.

any ideas?