Fly wheel Problem please help

I just put a big block chevy in my 78 pickup tonight. Had it all bolted up except for the the torque converter. I got under it turned the flywheel around and around and found out the holes are about a half of a hole off from the flywheel.I never heard of such a thing before. So I slid the transmission back took the flywheel off and compared it to a small block one I had laying around. The small block one has a smaller diameter set of holes and a set of bigger diamter set of holes. The big block one just has a set of bigger diameter set of holes. Piss me off. I was thinking could I just take a die grinder and get the holes slotted out. I know there balanced and stuff so I would have to do each hole evenly. Or should I try to find another flywheel with the right diameter bolt hole pattern. Thanks for any advice. Mud runs are coming to soon. Sorry about the little novel i wrote. I just trying to vent a little.

the right i have seen this gm used the two bolt patterns but i have bin there were you are if it out get the rigth one but ihave cut the holes out do not get nuts with the grinder use lock tight and keep the holes small and use good washers thick to hold it

Get a dual pattern for $56.50 from summit.


http://store.summitracing.com/defaul....asp&x=52&y=12

Do as Viking has suggested and get the correct one!

yes get the right one but the last time i seen this was a$ 56. fly wheel if you are in need of a fixs slot the holes drill it out to 1/2 use grade 8 fine threads stuff with good thick washer s a e some fly wheels stock have big sloted holes in them that why i go up on bolts .if it 1/2 the hole you can do it it has been done but it up to you how much money you have. the last time it was done it was 800hp 620 big block the clamping and surface area is what you are looking for so it can t move yes it a cheesy fix s