The only reason I did my rb26 was because I was in Japan. There is no way at the time i could have afforded to due it in the US. I go the entire drive train plus a crapload of other stuff for the swap for less then what you can get an rb26 with a cut harness from ebay.
If you want to do a rb25or rb26 right and have 450-500 HP you need to have 10-15K in the bank easy. I think if you put that kind of money smartly into a v-8 swap you’d have a faster car all around.
My 2 cents