When I started racing, after a lot of research on what guys use, I ended up just using small block springs. They tend to naturally lower the car a bit from the extra weight (just perfect, in my opinion, on my car), and give good rise when launching. They'll both be "floaty" on the road, so you'll want to back them up with good shocks, preferably adjustable if you want to street drive
and race it. That is unless you like the roller coaster feel..lol
From what I gathered, the Moroso springs were basically the same as small block springs, as far as spring rate goes. But most of the guys that I found that had ran them said it made their car sit tall because they were so long. Not sure if anything has changed with them, but that's the info that I came across.
Edit: Jared, I know you've seen my car stationary, but it's been a while, so I added a picture to show how the stance is. I originally had 14" wheels on the front with the big block springs that I originally had in it, but I switched out to 15's for a couple reasons. The 14's just sat too low with the small block springs, so I wanted to gain back a bit of clearance, plus I just like the bigger front tire look on a race car (not that my car
is a race car). Coupled with the 1" lowered rear CalTrac split monoleafs, it has a slight rake, but nothing drastic.