Master power turbo and external wastegate slant 6?

Hey all, bought this turbo for my 2.3, found out its a little too laggy, so I was saving it for my slant 6 project, but that now belongs to my son. What I have is a Master power turbo, #810021 stage 3 turbine, .68 A/R housing. The intake side is a 50 trim housing, with a 58mm inducer 84mm exd wheel. 4 bolt exhaust housing external wastegate only. Was on a 3.8 turbo t/a (gn engine) made 440rwhp. turbo has less than 3500miles on it. This is not a cheap Chinese turbo was $800 new. The waste gate is a 38mm emusa. 7psi spring and is new. Asking $350 obo for both. Plus actual shipping costs. Will also trade for Small block or big block performance parts, nitrous kit, 904 hi stall lockup converter.