I don't know if there is a difference in the old la 360 cranks and the mags but we tried to brake a mild LA 360 build with 125 hp No2 and couldn't , we sprayed this poor pup to death and it lived , I figure the total HP with the spray was around 500 to 525 and rpms were 6500 to 7k max floating all the way, stock rods with arp bolts, ext ball cast crank strait from the junk yard It was fun