Need a small base circle cam because the non roller block has a shorter lifter bore. If you use a std base circle cam you run the risk of the oil hole on the lifter body becoming exposed at max lift, then the lifter has no oil pressure. Some of these non roller blocks have an even shorter lifter bore because ford loved to put a huge radius on top of the lifter bore, which makes the bore even shorterI’ve got a roller 5.0 sitting on the floor and it FITB me thinking, can I put the cam and roller lifters/spider in the 88 Windsor at came with a flat tapper cam? I’d drill and tap holes for the spider obviously, just wondering if I would need an undersized journal type cam or would the lifters pop out of the block etc