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First things I would buy/modify is the fuel setup for sure. At least 550cc, a real walbro 255. If you are in south florida call up nipponpower. They for sure have in stock ocally and at a great price. You also got penty of local sr20 gurus and mechanics available to you. Any more questions feel free to pm me.
I would contact him^ and get his brother to tune your car once you have it all straightened out. You should always set your goals before you start ordering parts. It seems like your "mechanic" is just taking you for a ride to make money off you, unless he knows nothing about sr20's because it doesn't seem like it. Either that or you didn't have a reasonable plan and told him you would eventually be going for huge power. What do you want for the end result of your car. If you are keeping the t28 I would stick with the 370's @ 4bar, a walboro pump and probably a slightly larger maf, not sure where the det ones top out at. Sounds like you have either the start of a nice setup that when finished will be very fun to drive or a disaster/money pit waiting to happen.
Drew