Under 1000kg... I'm impressed! Jeez, I think mine will be WAY more than that. Oh well, I'd better spin that blower harder now!!!
Adam - Have you based your top speeds on running 6th gear with the 4.5:1 diff ratio? For a dedicated "top speed" effort, you'll have more torque available if you gear the car for top speed in 4th (1:1). A 4.5:1 diff would render 1st gear pretty much useless, unless of course you're planning on pulling a few tree stumps around the place!
You two need to get more sleep.... Only 5hrs sleep between messages here!?!
And another thing - I think I'm finding myself in the minority around here. There are LT1 Chev guys, LS1 chev guys, Lexus quad cammer guys, turbo guys, big block guys.... Whatever happened to the old tried and true blown small block????