Having revived few old 262c ( and broken up some) I feel your pain but there is only one way to deal with it... New injectors and seals, the engine will simply not behave if there are any airleaks. they are about £23+vat each and available everywhere.
When you did the metering unit did you hone the cast faces flat and to a polish and did you smear a very thin film of Loctite on each face? If not you get leakage across the ports.
Another common issue is the tank rusting from the inside.
Was the car you got the one that went to auction with 20000mls a few months back?
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