RE: Drop a 340 in for $1400 or mod the 273
I have always heard, go with the cubic inches. The 340 is a high performance engine and thats the only way it came. I'd opt for that and it will bolt in right where the 273 came out. Then offer to sell the 273 on E-Bay or if its original, keep it. But its your choice and either one is a keeper. Good luck.