Back breaking work doing under hood with all the stuff needed to be removed its easier to remove engine and then reinstall it, IMO I have done it and theres always something that seriously interferes with progress. New cam will need degreed and how will you do that under hood? you will have almost everything unhooked and removed except the tranny and by time you remove the front of the car to install camshaft you can remove the few more bolts for tranny, converter plate and starter and have easy install of all your things and have it complete and ready to install it back in no time JMO work smart NOT hard LOL!