Is this a good deal?

Found this ad on C/L here. Is this a good price even if i DONT have him powder coat the houseing? How well will it push my 351? Looking to get about 600 to the wheeels. Heres the ad: i am selling a new , never used never mocked up
master power turbo comes with facroty box, gaskets and hardware T-76 / Q-TRIM / 1.0 A/R

700 bucks and i will powder coat the compressor housing for free after payment to a color of your choice that i have in stock.

master power turbo chargers are high quality, high-performance that are comparable with the best in the industry. 5.0 mustang guys are getting in the 9's with these turbo's

part trade for ford 8 lug hp dana 44 and rear 60

HP Range 600-800

Compressor:
-A/R .72
-Air inlet 101.7
-Air outlet 66.0
-Inducer wheel 76.5
-Exducer wheel 103.5
-Trim 55

Turbine:
-A/R 1.00
-Inlet T4
-Turbine housing divided
-Exducer wheel 67.0
-Inducer wheel 74.0