Road Race Camaro.. TT Block Choice?

[gearhead1186]

Im building a 69 camaro with a max-g chassis frame. Its going to be a road course/street car. My goals is ~1000fwhp using and ls platform and twin turbos backed by a paddle shifted 4l80e.

Here is the pickle Im in. At that power level I have 3 choices of blocks..

1) GMPP Iron LSX --$2g ---- about 215lbs after machining
2) ERL prepped LS2 http://www.erlperformance.com/ -- $5200g ready for crank ----about 115 lbs after machining
3) LQ9/LQ4 6.0 liter truck block -- about $600 --- about 175lbs after machining

I would love to have an aluminum block since the tt setup will add even more weight but the price is a little extreme. Figuring a machined lsx block will be around 2600, the ERL prepped block is twice as much, another 2600.

Afer maching the LQ9/LQ4 will be about 1g and the ERL prepped block will cost me 4200 more.

Whats your opinion? I dont need to break any records, but I would like to be competitive in the road course. Iron or aluminum over the nose of the car?