Is two and a half thou too much.Crank is standard .

Are plus one thou bearings available?? Its outside limits

Two and a half thou clearance is still just within tolerance. If you want to get closer to the minimum tolerance of one thou then you will need to have the crank ground and run +10 thou bearings. I would suggest obtaining the bearings first.

Have you checked that your big ends are still round? It may be the rods that are out of size... How have you checked your clearance?

re the crankpin roundness, any more than .0005" (1/2 a thou) ovality and it really should be reground. I have seen low mileage 1275 cranks with .007" ovality there due to oil starvation on roundabouts etc.
IMO fitting a centre oil pickup is a bloody good idea.

[edit] I would rather have .001" extra clearance than .001" ovality. Ovality mucks up the oil film.

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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.

Thanks guys .The crank isn't the issue .Its fresh offset ground.
The aftermarket H beam rods are half thou oversize in the bore
Not sure if I need them closed and honed.grr

If your big end bores are oversize then you won't get the correct clamping pressure to hold the bearings in place which will more than likely lead to a spun bearing. Get them resized correctly

Last time, I got a set done by St George Cranks in Seven Hills, Spiro does nice work. I supplied him the ARP rod bolts.

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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.