Putting a 454 in 79 2wd Blazer any advice?

[Desert Rat]

Putting a 454 in a 2wd 350 powered 79 Blazer also going to use headers.I have factory 73 Big Block Mounts also have all the correct brackets pulleys.Anyone know of any other problems i should look foward to,or any extra holes i may need to drill?Hoping to get this done before it goes in to get painted Monday.Thanks

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69 GMC SWB 402t400 daily beater,.
67 GMC SWB 468t400 Project Go Fast

79 Blazer 2wd 350t350(awaiting its heart transplant)

1962 BelAir SW Project-currently 454t350.

99 Nissan Frontier 4cyl,5spd,-hey it gets good gas mileage,and the AC is COLD and its reliable!!!!

Located In Casa Grande,AZ(48 miles South of Phoenix)
WANTED 62-64 409 Engine,79 Chevy Blazer or P/U Door Panels,Dash Pad,Blazer Tailgate window,71-72 Leaf Spring Rearends(need 2)any ratio
Vintage Aluminum BBC valve covers,Crossram intakes,Finned Aluminum oil pans,63-63 Impala AT tilt column.Buy Sell or trade.