I personally think the old hilborn 2 port injections would be plenty and would look better on your setup. If you watch ebay motors hilborn injections you'll see one turn up ocasionally and very reasonably, like $500.00/$600.00, i ran both the 2 port and 4 port, with small inch motors yrs. ago and the 2 port out performed the 4 port.
JMO
Zip.