440’s would flow what your looking to do, and you could always bump the fpr a little if needed later on. but you have to match the impedance of the injector to what the ecu calls for. find out if what you have now are low imp or high imp.
new those garret turbo’s are $1200 shipped or so. BB’ centers can be rebuilt bu the parts are half the cost of the turbo. about $600. You can find ones used, make sure the blades arnt nicked, and the shaft play isnt out fo spec and you will be alright.