If you are going to build a stroker, do it with a 351 based motor. If you are going to do a buildup next spring, wait till then. There are only a few things needed to drop a 351 right in and it looks like you already have a cowl hood if your avatar is any indication so you should not have any clearance issues. Cost winds up being VERY minimally more with the 351 based stroker but your returns will be ridiculous. A mild one will make 500/500 to the wheels all day, get 15-18mpg highway and be perfectly streetable with a good custom ground cam from someone like FTI or Buddy Rawls.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.