Hey Rick,
If it were me, I'd buy a used built spec racing car.
I've built them and you will miss the season and spend more $ and time/hassle to sort it.
Give Tim a call. Even today, cause 944's is all he does.
Several good cars to Race ready to sell or rent. Shop near Charger Stadium San diego.
619.994.0919
comeauracing.com/cre/
Seven's Only is on the Buttonwillow race track grounds. Tom runs shop and they wrech, fabricate, manage and transport for arrive and drive. It is not cheap but nice group.
SoCal Racer Thomas uses them.
R2R in Orange county, are 944 racers and awesome, but they seem to be doing exotics more and may not be price motivated for 944 work.