Alan, Shocks/ springs will be the single biggest expense assuming that the car comes with adjustable rod ends all around. Konis, maybe Penskis(sp?).Then some custom made adjustable anti-roll bars. If I was spending your money I would do a cockpit adjustable rear bar. Have the car corner weighted and have the same guy get the bump steer as close as possible. Maybe the SPF's don't need this but I would check it.
Brakes, put on at least 13X1.25 on the front with 6 pots and 12X1.25 rotors on the back with 4 pots. If you are not fugal here you can really eat up some bucks. The good Wilwood stuff is OK. If you REALLY want to spend money Alcons will do it for you! Ask SPF about brakes and see if you can get this done right the first time. Duel masters and a cockpit adjustable brake bias bar for sure.
I would add a roll cage to any GT40 I build as well as a onboard fire system.
Again ONBOARD FIRE SYSTEM!!!!!! Best 500 bucks you ever spent! Also if the gearbox you use isn't equipped with a limited slip do this as your first upgrade. This is the most important upgrade. I really like my Quaife LDS. I would try to order my gearbox with one in it. Works like magic. You don't need a 6 speed. 2.3 1st, thouugh .8 5th with a 3.50 ish final is about right.
Now you need to spend some of that money on track time to get the car set up. This takes time. Take notes and one thing at a time! You will need a tire temp gauge, toe plates, caster/camber gauge and someone to help.
Lets say you spend a thou on some open track time. Gas, hotdogs, tires, brake pads and 3 or 4 days of track time ough to pretty much finish of the thou.
I would think you are fairly close to 20 thou. This is for parts and some labor. I assume you are going to put most of the parts on yourself or order it with then on the car from the beginning. If you have any money left have a custom alum race seat made. Add a 6 point harness if it has a 4 point and install it correctly.
By the way. If this is a track only car leave off the side windows. Or put a nice big hole in the drivers side one that you can get your hand out of.
Put 400Hp in this and I garrr--onnn-teee it will be FAST.