I have a 292 in my '55 Bel Air. I made my own front mounts, they bolt onto the front of the block on each side, & use a donut thru the crossmember. Made my own rear mounts too, using a truck bellhs'g. & a donut on ea. side, there are some pics of it in my link below. Notched the crossmember for pan clearance, cut a section from the oil pan for steering clearance, & added onto the back of the pan to get some capacity back. Ended up with a 6 qt. pan, 7 w/filter. Made my own oil pump pick up tube to match the pan. Used a remote filter to make front mount clearance. Modified the rad. support top brace for fan clearance. Ground off some of the cyl. head rear casting to give enough clearance to slide a cardboard piece between it & the firewall to check for running clearance. Run a MY6 O.D. 4 sp. trans. with a rear mount I made. Have 3.08 axle gears & routinely get 21.5 MPG on highway trips.
Did this about 4 yrs. ago & am extremely happy with it. It's my daily driver & it gets 12 to 15K. miles/yr.
Doug