1972 318 bottom end

Have a 72 swinger with a 318 2 brl numbers matching,would the bottom end be strong enough for a 400-450 HP build? Thanks for your input  

The rods bolts are the weakest part.  I would use ARP main bolts or studs, and arp rod bolts as a minimum.  Aftermarket rods would be a good upgrade.  

One shop said a forged crank should be used,my build would be the mmm 400 HP with 10-1 cr but with upgrades like aluminum heads and 2.02 valves and with a bigger cam,the original motor has 160 k and needs a rebuild.  

Have the crank checked for cracks. Make sure you have a good foundation before you start putting power to it. Rod Bolts are a throw away item. I don't reuse them. ARP has a high quality fastener.

Use ARPs Rod Bolts. Have the rods resized with those bolts.

When you torque the rods, follow ARPs procedure. They have their way of torquing all their high quality bolts.

Bob  

Thanks for the input guys,Mike  

a small mopar is fine with a cast crank and an auto trans. easily to a naturally aspirated 550hp. dumping the clutch at 6000 is better with a forged steel crank.