1963 Valiant

A V8 will fit. You need to modify the firewall by the distributor and wiper motor area. IIRC will need a V8 steering link too. Can keep original K member but new motor mounts. Header selection is limited and tight fit. Now, I have heard others have cut out a section of a donor 64 firewall and replaced it into the 63. Also heard of some doing customized (shorter) distributor to clear. Here is mine with stroked 360 LA block. We upgraded trans, rear, wheels, brakes, torsion bars, rad. It is slippery slope. Maybe stick with /6?