Just bought my first mopar. Looking for help!

And if you do a big block, the easier route is to go with a B383/400 instead of the RB 413/426/440. Before deciding, go look at bigblockdart.com and look at what it involves. When it comes to A body builds, even small blocks have their own set of challenges, but your ‘73 has several advantages making it more favorable for a big block. Pound for pound, dollar for dollar, the 340 based 3.58 & 3.79 inch stroker set ups with TFS heads are hard to match.