since they are not very costly, i plan on replacing my 81 malibu fuel tank sometime in 2020. would like to know what tank is in it now because i plan on the in tank 87 monte 4.3 f.i. tank with the drop in module. i run a n.a. q-jet crate motor now (375 hp). the current tank has a feed and return only. i will run a regulator with a return and would like about 6 psi. i used to have a 4.3 in an s-10 and it was tbi and ran a constant 12 psi all the time. i figure i can regulate that to 6 psi pretty easy. the f.i. tanks have a correct baffle. my 81 was a 267 c.i. with the computer. was wondering if i have a f.i. tank in it now or if this 267 came with tbi. seems like the stock tbi pump on the drop in module would do the job. opinions? thanks