Personally....I wouldnt mess with the gas tank, like stated above there are good in-line pumps that are quiet and will get the job done.

I would also agree looking into some of the TPI systems, once you get educated in them, they can be really easy and reliable.

and lastly....if you just have to have new age computer motor, try and find an LS1, they are getting very affordable and will come with the harness and computer most of the time. I just recently helped my wrenching buddy load up his LS1 he pulled from a wrecked TA. $2400 for a running motor, the t-56, harness and computer. I am finding even better deals like this monthly. I am not a fan of the LT1 for many reasons, so go for the LS's of you pass on the LT1