A blower cam will give you more power everywhere.
Specs,,,,all depends on how much you want out of the engine.
How much boost,etc.
You have stock rods? If so, that's going to limit your RPM & will allow you to chose accordingly.
For a blower for the street.
I would go w/about 144-116 lobe center.I like a smooth engine for the street,maybe a little lope to the engine idleing.
220 duration @ .050..500" lift or so,,,,like I said,all depends on your goals.
Thats just a guess w/the cam,but need to know what you want out of it.
My 250 had a solid cam w/specs of .540 lift, & 236 int. 246 ex. on a 115 lobe center,IIRC.
With this cam, you could definately here it lopeing @ idle.
Also,I had normally aspirated cams w/about the same duration & it never wanted to rev as fast or as far as it wanted to w/the blower installed,,it just wanted to keep reving & reving,,,the blower had a max RPM & I actually had to shift @ 7500 RPM,otherwise I would have over spun the Paxton & would have damaged it. It probably would have spun to 8000 RPM w/the correct sized pulleys for t Paxton, but this engine had stock,side grinded, polished & shot peened rods,,,it probably would have thrown a rod or 2?
This long block engine is still in my Car & still altogether,minus the intake & exhaust awaiting for my turbo stuff to throw on.
I ran about 10 psi @ the most & the engine would want to spin to 7500 RPM.
This was w/a Paxton SN 89 supercharger.
Estimated HP was about 400 HP @ the wheels & ran low to mid 12's in the 1/4.
This was my street car daily driver.
MBHD
