Is their a proper way to set the tensioner on an A+ 1275 or do you just simply do it by feel?

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Respect mine and I'll respect yours.

Yeah, bin it and put in a double row timing chain
Personal preference

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http://www.youtube.com/watch?v=nDMkVq1jRGU

What he said- ^^^
Some people fit a duplex chain and keep the A+ tensioner too. It's not designed for a duplex but apparently works, sort-of. I've never felt the need..
Note that most chains now are poorly made (compared to the Renolds UK chain of yesteryear)- they are loose when new.
The exception is the Jwis endless chain (made in Germany, around $60), Rolon chain is pretty good too.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Yes, by feel, enough to take any slack out of the chain, then just a little tension. I have been running the A+ tensioner on my race engines for years now without any dramas. These A series blocks have been line bored so the distance between crank and camshaft has been altered and the tensioner takes out any slack.

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Steve

Thanks, all done now.
I used a Rolon single row chain, permertight on the gasket and loctight on the bolts, should all be good fingers crossed

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Respect mine and I'll respect yours.