Deciding on replacement intake (318, details in post)

J1MMY said

Food for thought.

Expanding on the conversation then, I will get compression readings over Xmas. I cannot comment on the state of tune of the tunnel and carbs as do not know how well it is set up, a dyno run would give that info and tbh I hadn’t considered it. How well would a cross ram intake (if they’re available) weigh up?

And yes, agreed - performance without figures is a subjective thing.

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Probably the next best thing to a tunnel ram but, the tunnel ram will beat it by a large margin. Then you are starting from square one tuning 2carbs on a way different manifold and unported at that. You need to have a new manifold ported to match the port job on your heads. Is it all that important to get everything under the hood? I would leave it as it is and work on improving the setup as is if you want to increase performance.