Do I keep it? Or trash it?

Well long story short i picked up my 340 from the shop where it baked and pressure checked.Good news is it cleaned up real nice and no cracks BAD news is 4 cyclinders need sleeves(OUCH) he gave me an estimate of about $650 to do the sleeves and re-coil a few of the head bolts.He and the guy who is building the engine/motor both told me to trash it and buy a 360 magnum motor so i would like some advise DO I KEEP IT OR TRASH IT ????
If i keep it i will have about $1000 just in the block. $200 for the block $150 for bake and p/t and $650 in sleeve's thanks guys