School me on supercharging a 360

Hey Guys
I just picked up a 72 demon with a 340 and a 471 blower. First blower i have ever had so i'm a little on the paranoid side of it all right now. I have driven it a few times now and my temp gets up to 190 sometimes even 200 but then i get scared and pull over. Then i keep the waterpump running and the fan to cool it down. Now does this all sound way to hot to you guys?

My duster has always ran cool as a cucumber never over 170..

I'm not sure of the boost in the demon as the guy i bought it from wasn't sure of how much, there is a vacume gage in the car so is there a way to figure out the boost that way or do you have to measure the bottom and top pulley?

Its the same kind of problem with my Lil Red and my 4X4 they all seem to get up to 190 or so too which seems hot to me.

I cooked a 360 once so now i'm really paranoid on temps.

Here is some of the info on the motor set up.
9:1 compression
Solid lifter setup
Forged Pistons
J heads heavily ported, stainless steel valves, single groove retainers .600 lift
Aluminum 1.5 ratio roller rockers
Aluminum hold down blocks on the rocker shafts
Hardened push rods
Steel crankshaft, balanced assembly
750 Holley
727 trans with 3500 stall
5:13 rearend
aluminum be cool rad, electric fan, electric motor for water pump

So if anyone has any idea's for me to keep it cool, that would be great.
Thanks
Jason