Iput 175 to a 400 and a 455 with the 670 head and stock rods with TRW's. What I found is that RPM is the limiting factor, dont let that thing get over 6500 in a 400 and 6000 in a 455. It will go it a few times if you have a set of rods that havent been stressed much, like grandma driven 350 2 barrel rods with good bolts. If it has been in a high rpm car that has seen abuse, chuck them and get aftermarket rods.
The TRW's are heavy, the pins are heavy and stopping them at the top of the stroke is where you break them. The 455 lost #6 that way, the bolts held but the rod cap let go. Snapped it right next to the bolts and left the piston at the top of the bore. It did that at 5500 rpm in first gear. Nice flash under the hood and silence, well except for the noise of the car rolling to the big end...lol..
I highly recomend forged rods too, I wont build anything that will see some power with stock rods anymore. If its a daily driver that wont be raced then sure, but any track time will have some good rods. Up to you its your money, parts and time.
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