found this while surfing dont know if its been posted yet..
http://www.bdub.net/grockwell/
its from a motorhome site its on a 455, low profile big block intake with no exhaust crossover

 

Wow, are you saying someone is producing those? If so, definitely cool! Probably fit the 425 also then.....good info thanks!

 

try www.appliedgmc.com

you will also find headers, limited slip diff. and that intake mentioned before for 1st gen. toros.

you'll need some serious coin for that stuff and you'll probably get hood clearance issues with that intake if you don't use aftermarket air cleaner.

as far as i know the stock toro intake is not that bad...

don't know anyone who tried to fit these headers in a 1st gen. toro.