No. Should be able to do 730gas to 930 gas. Pistons might work if oversized sleeves used in 930. But 830 sleeves are different. I do want to see if 377 diesel pistons will fit into some gassers. Depends on bores.
 
We stock 4-1/8" overbore Sleeves & Pistons for the 251 & 377 Blocks from 1955 thru into the 70's. Our Sleeves will drop into the stock blocks without any modifications. You can easily do an inframe. Patterned after the overbore M&W kits.
 

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