Anybody using the R5/P7 for racing?

hows it going?
we are building a 68 dodge dart and putting a r5/p7 in it too!
i have been told that they will make 840 hp with only 9:5:1 :happy2:
and the heads with flow 360 out of the box and 410 with work :happy2:
i almost have every thing to this motor
i have a billet crank
a block
cv motor plate (witch you have to have)
i have my belt drive
my heads
all i really need is my rods, push rod, and pistons
i am buying all my parts off of ebay
from eatmon and a couple other guys
we are planing to put a turbo on it as soon as we get the money for it