I am thinking of purchasing a 1971 alfa spider in the Charleston SC area. However I would like to have a PPI done by someone that knows alfa's and can offer good advice as I will not be inspecting this personally.
If you can't get an Alfa specialist you can have a regular mechanic shop do much of the inspection anywa. Here's what I would think of:
1) Rust inspection - depending on the location, amount and depth usually can be the most difficult repair on the Alfa. With Spiders it tends to be mainly the floor plan (because they are convertible and don't have a duck *** tight water seal). Pull back carpet - look at the drain holes underneath front carpets. Check the floor behind the seat. Check the trunk especially the spare tire well. Make sure to get the car up in the air and check around the rockers, the floors and bottom of the trunk.
2) Check for worn suspension - not hard to rebuild, parts are readily available
3) Check for oil leaks, leaks around the head gasket. Do a compression test.
4) Check for oil in the coolant and vice versa. Oil in the coolant is not good, coolant in oil is much worse - can lead to main bearing damage
5) 71 Spiders had the 1750 engine with Spica. That's a very good engine. If it has a 2L in it, no worries but it does detract from the value of the car IMO.
6) Check lights, wipers, gauges. Electricals on these cars is relatively straight forward but still.
Good supply of spare parts readily available. '71s are quite desirable given the right condition and price of course. Good luck