That Howard intake is a rare one. You need to get over to Inliners.org and pose these questions. I've seen these intakes running on Inliners members GMCs but you need to find the man that own's one. Better yet, join Inliners Int. per the website and you'll then be able to contact some of our 'Tech Advisers', most of whom don't have the time for these forums.
Also you should make our annual Central Cal picnic in Lodi, CA in Sept, and rub elbows with our many GMC inline fanatics. Also Turlock Swap Meet last weekend this month, row 'O' I believe you'll find a few guys with lots of inline GMC stuff.
Best of luck
