1987 Other Subaru Models timing

Alright I have an 87 Subaru 1800 hatchback with all wheel drive and a dual overhead cam setup, it seems like it wants to and last time it had run very well then 2 wanna be mechanics tried to do an oil pump which in turn the entire timing system belts and all have to be removed, and after they did that it ran horribly at first but it did run but they ran it around anyway, and now it refuses to run at all ive redone the timing on it over and over again lining everything up the distributor tried every possibility but I just cant seem to get everything to line up it cranks freely has spark and fuel and seems like it wants to run occasionally sputtering and making some noise, but the other day me and a friend were talking bout it and what im possibly worried about is when they had the timing messed in the beginning and were driving it around is there any possibility the valves could have collided with the pistons if there is a possibility how would I check that preferably without removing the heads. Pleas help this was a great little car the 4 wheel drive was amazing and I wanna fix it!