As long as the basic shape is there (the square portion is the right size to slide in the brackets) it should still work for both stock engines and swap engines. Finding some way of securing it shouldn't be that hard. Hell, zipties would work in most cases even though it may not be ideal. Ideally though, an assortments of ends (cable ends and bracket pieces) would allow for even more applications. It would be cool to have a "universal" throttle cable that can be adjusted to suit many different swap choices or stock engines. The 87-88 cables don't usually work on the newer engines anyway. Older swap choices will only continue to disappear so having something more generic may be a better choice for the long run. Just my opinion.
I used an 87-88 L4 cable on my 4.9 swap. The plastic end does not just snap into the TC bracket. It slides in fine but the tab to lock it in place is in the wrong area. The TC bracket can easily have a new hole drilled to correct this on a 4.9 (not so sure on other swap engines). The only other issue is the cable is about 14" longer then I'd like for this particular swap but thats another story...
I'm thinking make a cable with lots of sheathing and the correct end to fit the gas pedal. Then add an assortment of generic ends and bracket pieces made from any material really (or offer choices for buying the correct one). This would make your cables the one to choose for basically any engine swap or
stock replacement. Do it once and cover as many applications as possible. The quality of your products is very well known. If you build it they will sell. I'm sure the word will spead very quickly too!
[This message has been edited by Fieroseverywhere (edited 04-16-2011).]