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You replaced the pistons, at a guess went to the biggest over size ;) Have recently bought 4 forged pistons for a crossflow/pre cross flow cross that were made by carillo for 200 inc vat. That is, to me, cheap. A ford pre crossflow engine can make a few BHP less that the lotus engine, just through using modern materials and better tollerances. The Lotus doesn't get that jump as it already had the close tolerances and better meterials.
Never used running in oils myself, just used cheap 20w 50/ 15w 40 mineral oils to flush the bores or anywhere that had had machining then sub 50mile oil and filter change then a 500 mile change. Then use the oil I would use normally. That fear of doing something wrong is normal. The first change is so quick as I use assembly lube, so the first oil is full of that.
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lynx
We weighed and balanced everything - pistons, rods (each end) and all the rotating bits. The machine work tolerances were all blueprinted and I used the best bearings/arp fasteners/pistons, etc - prob overkill - so the engine tolerances should be better than the factory. Let's face it though, it is still a 1950s engine.
Used Miller running in oil. Again, prob overkill, but I have been nervous as fuck about everything, so the (imaginary) piece of mind is worth it. Still having nightmares about a rod going through the block or finding a nut in the sump next time I drop the oil!