Cams , pushrods , roller, hydraulic

Hey guys , have an issue . I have a late model roller 360 la non-magnum block I’m building for my daughters 71 duster. When we looked at cams roller cams were big $$. So I went with comp cams hydraulic . I pulled the pushrods and rocker shafts off my the old 318. When I tried to set it up, the pushrods are too short , by like a lot , like an inch at least. So…. Wandering if these roller blocks are different ? Maybe can’t run hydraulic cam and lifters in them ? Not seeing anywhere that much if a difference in stock pushrods from 318 to 360 ? Any help much appreciated. Thanks