No, there was a 5- to 10-horse drop in published rating for '75 (105 in '74…100 for the Federal '75, 95 for the California '75). If you're basing on the pre-'72 "145 hp" rating, be aware that number was artificially inflated due to the gross HP rating system in use before '72; see here.
You won't gain anywhere near so much as you're hoping, unless your cat is clogged—which it very well might be; non-feedback fuel systems and catalytic converters were never a happy marriage.
