Hi the 6130S was used on then later 400 and 440 engines when Carter went from the mechanical open secondary to the velocity open air valve type, which stopped the bog when transitioning from 2 to 4 barrel operation. This was the predecessor to the new Edelbrock 14XX series marine carbs. I have taken many off of the 70's big blocks. The 6130S is a 750 CFM unit and too big for a 318 and will bog a bit at top end on a 360. The small blocks work well with the 600 cfm carbs.
The 4699S was used on the small block, 318 and some 360 units. When put on a big block they give great low end performance but restrict the high speed RPM's of a big block. I would not use it on an engine larger than a 383 big block. I have a perfect running carb from a 1970 318 marine and the manifold. I use the carb to start engines when rebuilt on the test stand. I am not sure the number and will not be back to the shop until spring. If yours is in this year range let me know.
Both these carbs are jetted and have smaller diameter metering rods than automotive engines to make them run a bit richer for marine use. The newer Edelbrock 14XX carbs are a great replacement, but are still carbs that do not do what fuel injection can. It is amazing what a 440 will do with fuel injection. I will be posting a write up of a drop in system we built and are testing now. It is built to USCG standards. Much better on fuel as well.
To read on the processor we used go to microsquirt website and start reading. We used a distributor less system with waisted spark like the newer trucks. Coils are at each plug like the new HEMI engines.
I hope the carb info helps.
Dan
