Mike: Thanks so much for your help. I've ordered a Calibra service manual and bought The Essential Buyers Guide (because I could get it on Kindle and I'm impatient. Also, dropped the sump, removed the timing belt, sprockets, and tensioners. Boy, that crank pulley bolt was stubborn. I've ordered a new oil pump and front cover, gaskets, and oil filter. More questions though...
Where do I find the chassis ID or VIN? (I have special construction stickers from Delaware and California) The car is badged HPC, has the Vauxhall 16v fi motor I presume to b C20XE, and a cardboard box of spares marked '94 Caterham. Title says '93 Special Construction. Would be nice to figure out exactly what I have.
About this foam insert in the sump. Never seen one before. Looks to be in good condition, but I'm wondering how one drains the oil and also how to accurately check oil level.
Other than that, seems pretty straightforward to get it back together and driving. I'm increasingly convinced dry sump is the way to go but need to figure out where the oil tank would go. None of the kits I've looked at include the tank.