does any one make a fuel /water seperator (with a drain) for standard big block MPI. Mine is 3-1/2 " tall.. It says thats what to use why cant yo use a taller one?

Check out the filters by Racor- they should have an off-the-shelf model that fits your application. Remember Coast Guard rules- metal body / bowl for closed engine rooms, plastic body bowl is allowed for outboards or open engine compartments. If you know the model number of the stock filter you should be able to cross reference. West Marine carries Racor filters.

Wix !

Wix does a nice set-up, large filter with drain and an aluminium head unit. I will see if I can dig up the part numbers.

I went to the NAPA site and was able to search on specific dimensions of my existing filter and was able to cross it to a WIX 3522 which is a filter / water seperator with drain. It's about 7" tall so you will need some room.

We use this filter:

http://www.jegs.com/webapp/wcs/store...ater+separator