well since you have the front off and have at least the area clear for the distance of the cam length----remove the oil pan---with a cam bearing driver tool, drive out the first and second bearings, remove from the bottom(wiggle out between the rods), install the second bearing, check for fit by installing the cam, if ok, remove cam, install first bearing, install cam for fit, if ok put on oil pan and button up engine---remember that the #2 and 4 cam bearing feed the rockers oil so you can check the job by checking for oil flow at rockers with the valve cover off---you can briefly run engine without front cover to check this if you want before you put all the accessories and h2o pump and radiator on

And don't be a stanger, come back and tell us how it went