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I was told by a work mate that there's no point upgrading the carb without also upgrading extractors and exhaust at the same time as it is like, as he said, "sticking your thumb up your butt and trying to fart at the same time" Is this true?
Yeah I dunno, normally carb, cam and extractors go hand-in hand, but there is nothing wrong with upgrading, bit-by-bit so to speak. I guess he's sorta right saying you won't get the full potential of the carb without all the other gear but that could also mean I'm not getting the best performance out of my setup without EFI and a decent computer to power it all. So it's true but it's also fairly obvious and somewhat open-ended/limitless (largely dependent on money)
But like the two gents said just above; nothing wrong with a single carb on the biggest of the A-series.
I think you're doing all the right things for a cheap power-up, starting with the big block of the A-series and then addressing it's carburation. Most the dudes miss the mark entirely and jump to twin 40's and a giant-ported GX head 'double springs', 'big valves', 'really lumpy cam' and then they sit there wondering why things are so difficult to get running right (I did that....
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You're on the right track with a very good start, beginning with a simple cost-effective arrangement will mean it is less complex and will give you a golden opportunity to learn how it all works with (arguably) a fairly simple configuration.
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